A nurse is caring for a client with severe hypoxemia and requires precise oxygen titration. Which oxygen delivery system would be most appropriate for this client?

Correct Answer: D

Rationale: High-flow nasal cannula (D) is best for severe hypoxemia needing precise titration, delivering up to 100% oxygen at 60 L/min with humidity, adjustable to SpO2 targets. Simple (A), non-rebreather (B), and partial rebreather (C) masks lack precision. High-flow ensures accuracy, per respiratory therapy, critical in severe cases.

Correct Answer: B

Rationale: Dorothy Johnson's Behavioral System Model (1960s) views humans as systems with seven subsystems like attachment e.g., adjusting a child's feeding to stress. Orem emphasizes self-care, Henderson needs, and Parse becoming. Johnson's focus on behavioral equilibrium helps nurses address disruptions, like anxiety in hospitalization, influencing pediatric and psychiatric care assessments.

Correct Answer: B

Rationale: Leadership is guiding care delivery (B), per nursing e.g., directing Mr. Gary's team. Not following (A), not task (C), not clerical (D) direction-based. B best defines leadership's role, enhancing care, making it correct.

Correct Answer: D

Rationale: Ribosomal RNA is produced in centrioles, though typically nucleolus (a document error), for protein synthesis. Mitochondria, Golgi, and organelles have other roles. Nurses apply this in understanding cellular repair, like in wound healing.

Correct Answer: A

Rationale: Kids with myelomeningocele (spina bifida) have higher latex allergy risk from repeated catheterizations epispadias, coxa plana, and rheumatic fever lack this exposure. Nurses use latex-free gear, preventing sensitization, crucial for this at-risk group.

Correct Answer: B

Rationale: The urea breath test detects *H. pylori* by measuring urease activity (CO2 output), offering high accuracy, low cost, and noninvasiveness. Stool antigen is accurate but less convenient, serology detects past exposure, and biopsy is invasive. Nurses favor this test for diagnosing ulcers, guiding antibiotic therapy, balancing efficacy and patient comfort.

Correct Answer: A

Rationale: Females (A) can carry recessive X-linked alleles (e.g., haemophilia) without expression due to a second X. Males (B) express them with one X. C and D are examples, not explanations. A is correct. Rationale: XX females mask recessive traits, unlike XY males, a genetic principle per sex-linked inheritance.

Correct Answer: A

Rationale: Nursing care plans are nurse-centered designed to address patient needs e.g., managing pain. Rationales justify interventions (not vice versa), they're written, and goals vary (not fixed). This nurse-driven tool, per NANDA, ensures systematic, patient-focused care delivery.

Correct Answer: D

Rationale: Undescended testicle (cryptorchidism) is a major risk factor for testicular cancer.